feat: validation, postgress connection,

projects/greenlight/cmd/api/errors.go

@@ -5,6 +5,12 @@ import (
 	"net/http"
 )
 
+// Note that the errors parameter here has the type map[string]string, which is exactly
+// the same as the errors map contained in our Validator type.
+func (app *application) failedValidationResponse(w http.ResponseWriter, r *http.Request, errors map[string]string) {
+	app.errorResponse(w, r, http.StatusUnprocessableEntity, errors)
+}
+
 // The logError() method is a generic helper for logging an error message. “Later in the
 // book we'll upgrade this to use structured logging, and record additional information
 // about the request including the HTTP method and URL.